Manufacture of color plates or screens for color photography.



senses.

teem

all wizom it may concern:

innnsnn, a subject of the King of Denmark,

vrately emulsified in gum dammar.

Inns HERMAN onzmswnnsnn, or sonminbn 2n; Home, DENMARK.

s PATENT onlucn.

' .-"-=IANUFACUBE on ooLon means on. scnnnns non COLOR PHOTOGRAPHYY.

. Be it known that I, J ENS HERMAN Cmus residing at Sollerod pr. Holte, Denmark, haveiuvented a new andv 'ment in or'Relating to the Color Plates or Screensfor Color Photography; and I do hereby declare the following to be a full, clear, and oTfthe same.

The invention relates toa methodof making color plates of screens in three (or more) colors for color photography. The production ofsuch plates has been attempted in some cases by applying -to the plate a lineengraving in the colors in question or, by Lumiere, by covering the plate with organic particles, for instance starch-grains, which have beforehand been'dyed withthe colors desired. I y

. According to the-present invention colored elements are used, which are in a liquid state when being applied to the plate, or are brought into a liquid state when applied to the plate. By way of example the produc mg of a multicolored screen plate of this kind will now be described.

in '100 parts of water 25 parts of-guin arabic and 25 parts of dextrin are dissolved. The viscous liquid is divided into three parts, which are dyed with the dyes in question, when the colored solutions are sepaemulsifying can bee'fi'ected by the solution (if gum arabic and dextrin being pressed-'- through a fine hole into a lac solution, the 'latter being agitated, or simply by shaking the solution of gum .arabic and dextrin tov' gether with the lac solution, whereby the former-will divide-into fine globules. When thegum-dammar is of a suitable concentra-- tion, colored globules of about uniforms1ze hit are obtained, so as to avoid a subsequentseparation of the globules according to size. After the emulsifying step, the mass is preferably thinned, and to this end is added one or more times to the three portions, the globules being allowed tosink to, the bottom, and the liquid above being removed by decantation. This decantation with turpentine aims at removing most of the resin (gumdammar). Finally the difierent colored globules are suspended separately in benz in,

to which is added a uantity of a substance,

less volatile than bennin, foninstance kerouseful Improve- Manufacture of.

v lac.

exact description been provided individual other.

- posing the This I l -'ules ,This is the case Specification of Letters Patent. Patented June 13: 1911. Application filed February 16, 1909. Serial No. 478,154. I V

some or some solid substance soluble "in benz 1n for instance a resin or a very fine emulslon of some solid substance. A suitable mixture. is constituted. by 100 partsf'of ben zin, 10 parts of tetrachlorid of, carbon, 10'- parts of kerosene, and 0.5 part of asphalt The three portions are mixed and poured overa plate, which has previously with a thin cover of caoutchouc or the like. This caoutchouc-cover swells and retains the undermost globules, while the remainder of the globules float off the plate, when the same is held in an oblique position; In many cases the caoutchouc-coating can be dispensed with, the

. globules spontaneously adhering to the screen-plate. The adding of the less volatile substance has the efi'ect of preventingthe globules from difiusing into each This flattening or spreading of the globules can be further encouraged by explate to vapors of water or humid cold air. The gum-dextrin emulsionsmust after the drying be coated with a cover of lac or varnish, and then the'sensitive emulsion (bromid' of silver-emulsion or the like) can be applied.

. In a quite similar manner emulsions of other substancescan be produced, especially all kinds of; colloids, for instance gelatin emulsion, casein emulsion, viscose emulsion, ac "emulsions, etc., the producing of the colored elements, viz: the dividing into glob ules of a suitable substance,'be1ng effected by emulsifying the substance in question in a liquid (dissolved or melted) state in some liquid, in which the substance in question is totally or nearly insoluble.

It is often superfluous to provide the plate with a special cover for retaining the emulsion-globules; on the other hand a special effect can be obtained by applying the dyed globules in a fluid or gelatinous state to the plate, imparting color to the coating of theplate by dilfusion the plate itself constituting a color-screen after removal of the glob: when for instance a cover of collodion is used.

Under certain circumstances a special effect'can be obtained by the emulsified 'portions being of different kind, for instance one POI'tlOIlOf globules consisting of lac, a second of gelatin, etc. I It can hereby be obtained that the difi'erent fields of thesscreen present diflerent qualities when influenced ferentcolors, and coating a plate with the by changes of temperature, dissolvents, solumixture of suspended globules.

tion of dyes, reagents, etc. 3. The method of producing a multi- Having thus described my invention, 1 colored screen, which consists in emulsifying claim as new and desire to secure by Letters liquids of different colors in separate. por- Patent. I tions of viscous liquid, thereby producing 1. The method of producing a mutiglobules, thinning the viscous liquid by colored screen, which comprises emulsifying means of a solvent for the same, then deeach of a plurality of colored liquids in a canting the thinned viscous liquid to efiect separate portion of viscous liquid, thereby the removal thereof, removing and substitutproducing globules of substantially uniform. ing the solvent by means of another liquid,

sizes, forming a mixture of different colors mixing globules of difierent colors suspended of such globules and coating a plate with in said last mentioned liquid, and coating said mixture of globules. a plate with the mixture of suspended 2. The method of producing a multiglobules.

colored screen, which comprises emulsifying In testimony whereof, I have signed my liquids of diflerent colors in separate por name to this specification in the presence of tions of viscous liquid, thereby producing two subscribing witnesses globules, thinning the viscous liquid by JENS HERMAN Cl-IRISTEXSEN. means of a solvent for the same, then de- Witnesses:

'canting the thinned viscous liquid to efiect Ono-1L VILHELM SCHOU,

the removal thereof, mixing globules of dif- Vreeo BLOM. 

